m0n0wall Forum - Updated firmware and interfaces disappear/change

Hey guys, i'm fairly new to m0n0wall and am trying to set it up mainly for NAT and as a hardware firewall in my university dorm.
I'd had m0n0 installed on a CF card for 6months+ as i was also messing with it at home, so i think it was a fairly old version. I had 3 NICs installed - i wanted an OPT incase i added a DMZ or something later - 2 identical and one of another brand, and they all used to be detected.

Once i'd had a play around at setting it up in the dorm i saw the update firmware option and went ahead and downloaded the latest stable release (i don't think it was a beta, but maybe it was..) to my desktop and uploaded it. On rebooting only 2 "sis0" and "sis1" interfaces are detected, when i don't think any cards before were "sis-anything".
So i took out the CF card and tried loading a range of other "older versions" and still have the same thing, right back to 1.21

Any ideas why this is?